/*
 * Copyright (C) 2011 Patrik �kerfeldt
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ykdl.member.kid.widget;


import com.ykdl.member.kid.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Animation.AnimationListener;

/**
 * A FlowIndicator which draws circles (before for each view). 
 * <br/>
 * Availables attributes are:<br/>
 * <ul>
 * activeColor: Define the color used to draw the active circle (default to white)
 * </ul>
 * <ul>
 * inactiveColor: Define the color used to draw the inactive circles (default to 0x44FFFFFF)
 * </ul>
 * <ul>
 * inactiveType: Define how to draw the inactive circles, either stroke or fill (default to stroke)
 * </ul>
 * <ul>
 * activeType: Define how to draw the active circle, either stroke or fill (default to fill)
 * </ul>
 * <ul>
 * fadeOut: Define the time (in ms) until the indicator will fade out (default to 0 = never fade out)
 * </ul>
 * <ul>
 * radius: Define the circle radius (default to 4.0)
 * </ul>
 */
public class CircleFlowIndicator extends View implements FlowIndicator,
AnimationListener {
private static final int STYLE_STROKE = 0;
private static final int STYLE_FILL = 1;

private float radius = 20;
private float circleSeparation = 2 * radius + radius;
private float activeRadius = 0.5f;
private int fadeOutTime = 0;
private final Paint mPaintInactive = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint mPaintActive = new Paint(Paint.ANTI_ALIAS_FLAG);
private ViewFlow viewFlow;
private int currentScroll = 0;
private int flowWidth = 0;
private FadeTimer timer;
public AnimationListener animationListener = this;
private Animation animation;
private boolean mCentered = false;

/**
* Default constructor
* 
* @param context
*/
public CircleFlowIndicator(Context context) {
super(context);
initColors(0xFFFFFFFF, 0xFFFFFFFF, STYLE_FILL, STYLE_STROKE);
}

/**
* The contructor used with an inflater
* 
* @param context
* @param attrs
*/
public CircleFlowIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
// Retrieve styles attributs
TypedArray a = context.obtainStyledAttributes(attrs,
		R.styleable.CircleFlowIndicator);

// Gets the inactive circle type, defaulting to "fill"
int activeType = a.getInt(R.styleable.CircleFlowIndicator_activeType,
		STYLE_FILL);

int activeDefaultColor = 0xFFFFFFFF;

// Get a custom inactive color if there is one
int activeColor = a
		.getColor(R.styleable.CircleFlowIndicator_activeColor,
				activeDefaultColor);

// Gets the inactive circle type, defaulting to "stroke"
int inactiveType = a.getInt(
		R.styleable.CircleFlowIndicator_inactiveType, STYLE_STROKE);

int inactiveDefaultColor = 0x44FFFFFF;
// Get a custom inactive color if there is one
int inactiveColor = a.getColor(
		R.styleable.CircleFlowIndicator_inactiveColor,
		inactiveDefaultColor);

// Retrieve the radius
radius = a.getDimension(R.styleable.CircleFlowIndicator_radius, 4.0f);

circleSeparation = a.getDimension(
		R.styleable.CircleFlowIndicator_circleSeparation, 2 * radius
				+ radius);
activeRadius = a.getDimension(
		R.styleable.CircleFlowIndicator_activeRadius, 0.5f);
// Retrieve the fade out time
fadeOutTime = a.getInt(R.styleable.CircleFlowIndicator_fadeOut, 0);

mCentered = a.getBoolean(R.styleable.CircleFlowIndicator_centered,
		false);

initColors(activeColor, inactiveColor, activeType, inactiveType);
}

private void initColors(int activeColor, int inactiveColor, int activeType,
	int inactiveType) {
// Select the paint type given the type attr
switch (inactiveType) {
case STYLE_FILL:
	mPaintInactive.setStyle(Style.FILL);
	break;
default:
	mPaintInactive.setStyle(Style.STROKE);
}
mPaintInactive.setColor(inactiveColor);

// Select the paint type given the type attr
switch (activeType) {
case STYLE_STROKE:
	mPaintActive.setStyle(Style.STROKE);
	break;
default:
	mPaintActive.setStyle(Style.FILL);
}
mPaintActive.setColor(activeColor);
}

/*
* (non-Javadoc)
* 
* @see android.view.View#onDraw(android.graphics.Canvas)
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int count = 0;
if (viewFlow != null) {
	count = viewFlow.getViewsCount();
}

// this is the amount the first circle should be offset to make the
// entire thing centered
float centeringOffset = 0;

int leftPadding = getPaddingLeft();

// Draw stroked circles
for (int iLoop = 0; iLoop < count; iLoop++) {
	canvas.drawCircle(leftPadding + radius + (iLoop * circleSeparation)
			+ centeringOffset, getPaddingTop() + radius, radius,
			mPaintInactive);
}
float cx = 0;
if (flowWidth != 0) {
	// Draw the filled circle according to the current scroll
	cx = (currentScroll * circleSeparation) / flowWidth;
}
// The flow width has been upadated yet. Draw the default position
canvas.drawCircle(leftPadding + radius + cx + centeringOffset,
		getPaddingTop() + radius, radius + activeRadius, mPaintActive);
}

/*
* (non-Javadoc)
* 
* @see
* org.taptwo.android.widget.ViewFlow.ViewSwitchListener#onSwitched(android
* .view.View, int)
*/
@Override
public void onSwitched(View view, int position) {
}

/*
* (non-Javadoc)
* 
* @see
* org.taptwo.android.widget.FlowIndicator#setViewFlow(org.taptwo.android
* .widget.ViewFlow)
*/
@Override
public void setViewFlow(ViewFlow view) {
resetTimer();
viewFlow = view;
flowWidth = viewFlow.getWidth();
invalidate();
}

/*
* (non-Javadoc)
* 
* @see org.taptwo.android.widget.FlowIndicator#onScrolled(int, int, int,
* int)
*/
@Override
public void onScrolled(int h, int v, int oldh, int oldv) {
setVisibility(View.VISIBLE);
resetTimer();
flowWidth = viewFlow.getWidth();
if (viewFlow.getViewsCount() * flowWidth != 0) {
	currentScroll = h % (viewFlow.getViewsCount() * flowWidth);
} else {
	currentScroll = h;
}
invalidate();
}

/*
* (non-Javadoc)
* 
* @see android.view.View#onMeasure(int, int)
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(measureWidth(widthMeasureSpec),
		measureHeight(heightMeasureSpec));
}

/**
* Determines the width of this view
* 
* @param measureSpec
*            A measureSpec packed into an int
* @return The width of the view, honoring constraints from measureSpec
*/
private int measureWidth(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);

// We were told how big to be
if (specMode == MeasureSpec.EXACTLY) {
	result = specSize;
}
// Calculate the width according the views count
else {
	int count = 0;
	if (viewFlow != null) {
		count = viewFlow.getViewsCount();
	}
	float temp = circleSeparation - 2 * radius;
	result = (int) (getPaddingLeft() + getPaddingRight()
			+ (count * 2 * radius) + (count - 1) * temp + 1);
	// Respect AT_MOST value if that was what is called for by
	// measureSpec
	if (specMode == MeasureSpec.AT_MOST) {
		result = Math.min(result, specSize);
	}
}
return result;
}

/**
* Determines the height of this view
* 
* @param measureSpec
*            A measureSpec packed into an int
* @return The height of the view, honoring constraints from measureSpec
*/
private int measureHeight(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);

// We were told how big to be
if (specMode == MeasureSpec.EXACTLY) {
	result = specSize;
}
// Measure the height
else {
	result = (int) (2 * radius + getPaddingTop() + getPaddingBottom() + 1);
	// Respect AT_MOST value if that was what is called for by
	// measureSpec
	if (specMode == MeasureSpec.AT_MOST) {
		result = Math.min(result, specSize);
	}
}
return result;
}

/**
* Sets the fill color
* 
* @param color
*            ARGB value for the text
*/
public void setFillColor(int color) {
mPaintActive.setColor(color);
invalidate();
}

/**
* Sets the stroke color
* 
* @param color
*            ARGB value for the text
*/
public void setStrokeColor(int color) {
mPaintInactive.setColor(color);
invalidate();
}

/**
* Resets the fade out timer to 0. Creating a new one if needed
*/
private void resetTimer() {
// Only set the timer if we have a timeout of at least 1 millisecond
if (fadeOutTime > 0) {
	// Check if we need to create a new timer
	if (timer == null || timer._run == false) {
		// Create and start a new timer
		timer = new FadeTimer();
		timer.execute();
	} else {
		// Reset the current tiemr to 0
		timer.resetTimer();
	}
}
}

/**
* Counts from 0 to the fade out time and animates the view away when
* reached
*/
private class FadeTimer extends AsyncTask<Void, Void, Void> {
// The current count
private int timer = 0;
// If we are inside the timing loop
private boolean _run = true;

public void resetTimer() {
	timer = 0;
}

@Override
protected Void doInBackground(Void... arg0) {
	while (_run) {
		try {
			// Wait for a millisecond
			Thread.sleep(1);
			// Increment the timer
			timer++;

			// Check if we've reached the fade out time
			if (timer == fadeOutTime) {
				// Stop running
				_run = false;
			}
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	return null;
}

@Override
protected void onPostExecute(Void result) {
	animation = AnimationUtils.loadAnimation(getContext(),
			android.R.anim.fade_out);
	animation.setAnimationListener(animationListener);
	startAnimation(animation);
}
}

@Override
public void onAnimationEnd(Animation animation) {
setVisibility(View.GONE);
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationStart(Animation animation) {
}
}